pre @ - @ war raaf , sea ##plane squadron was part of no . 1 ft ##s and operated super ##marine southampton flying boats and de havilland gi ##psy moth float ##planes , among other types . during this posting head ##lam was promoted to flying officer , on 1 july 1935 , and wrote a paper on national defence in which he suggested that with " strong air forces , naval forces ( including submarines ) , and fixed defences , australia may be made practically in ##vu ##ln ##era ##ble " . according to air force historian alan stephens , this paper " in effect , defined the ' anti @ - @ lo ##d ##gm ##ent ' concept which has been a persistent feature
pre @ - @ war raaf, seaplane squadron was part of no. 1 fts and operated supermarine southampton flying boats and de havilland gipsy moth floatplanes, among other types. during this posting headlam was promoted to flying officer, on 1 july 1935, and wrote a paper on national defence in which he suggested that with " strong air forces, naval forces ( including submarines ), and fixed defences, australia may be made practically invulnerable ". according to air force historian alan stephens, this paper " in effect, defined the'anti @ - @ lodgment'concept which has been a persistent feature